Make contributing easier

Created by: svenefftinge

Hey there 👋 We are on a mission to simplify open-source work and encouraging contributors to get started through automated dev environments.

This PR adds a minimal config to this repo, which allows your community to quickly spin up a fully initialized dev environment. Please note, that this not only automates the setup but also pre-builds the project before users open it - think CI for dev environments.

I have configured it so that the main yarn && yarn build is executed during prebuild and yarn start is executed when a contributor opens the environment. I have also added a second terminal that builds and runs the website (docusaurus). Let me know if there are any VS Code extensions that should be pre-installed.

Please try it out: https://gitpod.io/#https://github.com/svenefftinge/create-react-app/tree/gitpod_config

I hope this is useful for your community.